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    <h1>代码</h1>
    <h2>第一种方式 pre</h2>
    <pre>
      &lt;article&gt;
        &lt;h1&gt;Article Heading&lt;/h1&gt;
      &lt;/article&gt;
    </pre>
    <h2>第二种方式 code</h2>
    <p><code>header</code> 左边是一段代码</p>
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